CN116447226A

CN116447226A - Magnetic suspension axial bearing assembly and compressor

Info

Publication number: CN116447226A
Application number: CN202310413313.9A
Authority: CN
Inventors: 邓哲浩; 孙建东; 石飞虎; 陈雨琴
Original assignee: Runa Smart Equipment Co Ltd
Current assignee: Runa Smart Equipment Co Ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-07-18

Abstract

The invention discloses a magnetic suspension axial bearing assembly and a compressor, which belong to the technical field of magnetic suspension bearings and comprise a rotor, a bearing chamber, a protection bearing and a magnetic bearing body rotationally connected with the rotor; the protection bearing is sleeved on the rotor, the magnetic bearing body and the bearing chamber are integrally formed, and the protection bearing is detachably connected in the bearing chamber. According to the invention, the magnetic bearing body and the bearing chamber are arranged into an integrally formed structure, and the protection bearing can be directly arranged on the magnetic bearing body during actual installation, so that the protection bearing and the magnetic bearing body are integrated into a whole, the integral structure is simpler, the number of parts to be assembled is reduced, the assembly process is simpler, the assembly is more convenient, and the cost is saved; in addition, after the number of assembled parts is reduced, the accumulated tolerance of the parts can be effectively reduced.

Description

Magnetic suspension axial bearing assembly and compressor

Technical Field

The invention belongs to the technical field of magnetic suspension bearings, and particularly relates to a magnetic suspension axial bearing assembly and a compressor.

Background

The magnetic suspension bearing is a novel magnetic machine, and is a novel high-performance bearing which utilizes the magnetic force to suspend a rotor in space. The rotor and the stator have no mechanical contact, so the rotor and the stator have no mechanical friction, and have the characteristics of low loss, low vibration, no need of lubrication, small pollution to the environment, capability of running at an ultrahigh speed for a long time and the like.

But the magnetic suspension bearing is generally used with a protection bearing in the operation process, and the protection bearing has the following functions: when the rotor rotates unstably, the rotor is in friction contact with the protection bearing, so that the bearing iron core of the magnetic suspension bearing is protected from being damaged due to friction with the rotor.

As shown in fig. 1, the magnetic suspension bearing in the prior art includes a rotor 1, a thrust disc 2, a front bearing coil 31, a rear bearing coil 32, a front axial bearing core 41, a rear axial bearing core 42, a magnetic steel 5, an axial core 6, a bearing chamber 7, a bearing gland 8 and a protection bearing 9, wherein the protection bearing 9 is installed in the bearing chamber 7, and the bearing chamber 7 and the rear axial bearing core 42 are designed separately, and when in actual installation, the protection bearing 9 is installed in the bearing chamber 7 first, and then the bearing chamber 7 is assembled on the rear axial bearing core 42, and the whole installation process needs multiple assembly, so that the number of assembly parts is large, the assembly process is complex, the actual assembly cost is increased, and meanwhile, the tolerance accumulation error is easy to cause due to the large assembly times.

Disclosure of Invention

The invention aims at: in order to solve the problems of high assembly cost and large error of the existing magnetic suspension bearing, the magnetic suspension axial bearing assembly and the compressor are provided.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a magnetic levitation axial bearing assembly comprising:

a rotor;

the protection bearing is sleeved on the rotor; and

the magnetic bearing body is rotationally connected with the rotor, the magnetic bearing body and the bearing chamber are integrally formed, and the protection bearing is detachably connected in the bearing chamber.

Preferably, the magnetic bearing body is provided with a round hole for the rotor to penetrate, and the bearing chamber is arranged on the inner wall of the round hole.

Preferably, the bearing chamber has a stepped annular groove structure in a longitudinal section for clamping the outer contour of the protection bearing in the bearing chamber.

Preferably, the rotor penetrates from one end of the round hole and penetrates out from the other end, and the bearing chamber is arranged at the other end of the round hole.

Preferably, the magnetic bearing body includes a rear axial bearing core, and the bearing chamber is disposed on the rear axial bearing core.

Preferably, the protective bearing is pressed into the bearing chamber by a bearing cap.

Preferably, the bearing cap is fixedly mounted on the magnetic bearing body by a fastener.

Preferably, the rotor is further provided with a thrust disc in interference fit, and the thrust disc is rotationally embedded in the inner cavity of the magnetic bearing body.

Preferably, the magnetic bearing body comprises a front axial bearing iron core with a front cavity and a rear axial bearing iron core with a rear cavity, wherein the front cavity is internally provided with a front bearing coil, and the rear cavity is internally provided with a rear bearing coil.

The axial iron core is arranged at the periphery of the thrust disc, and the magnetic steel is arranged on the axial iron core.

The compressor comprises a motor on the compressor and the magnetic suspension axial bearing assembly, wherein the magnetic suspension axial bearing assembly is arranged on the motor in the compressor.

In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:

1. according to the invention, the magnetic bearing body and the bearing chamber are arranged into an integrally formed structure, and the protection bearing can be directly arranged on the magnetic bearing body during actual installation, so that the protection bearing and the magnetic bearing body are integrated into a whole, the integral structure is simpler, the number of parts to be assembled is reduced, the assembly process is simpler, the assembly is more convenient, and the cost is saved; in addition, after the number of assembled parts is reduced, the accumulated tolerance of the parts can be effectively reduced.

2. In the invention, the bearing chamber is provided with the annular groove, and the protection bearing is completely positioned in the annular groove, namely, the end part of the protection bearing is controlled not to protrude from the interior of the annular groove, so that the protection bearing is penetrated when the rotor penetrates through the round hole on the magnetic bearing body, the axial length of the rotor can be shortened, the solid frequency of the rotor is improved, and the rotor can reach higher rotating speed.

Drawings

FIG. 1 is a schematic diagram of a prior art magnetic bearing assembly in semi-section;

FIG. 2 is a schematic diagram of a magnetic suspension axial bearing assembly according to the present invention;

fig. 3 is a schematic diagram of a magnetic suspension axial bearing assembly according to the present invention.

Legend description: 100. a rotor; 200. a bearing chamber; 300. protecting the bearing; 310. a bearing cap; 320. a fastener; 400. a magnetic bearing body; 410. a round hole; 420. a rear axial bearing core; 430. a thrust plate; 440. an axial iron core; 450. magnetic steel; 460. a rear bearing coil; 470. a front axial bearing core; 480. a front bearing coil.

Detailed Description

The invention will now be described with reference to specific examples.

As shown in fig. 2 to 3, the magnetic levitation axial bearing assembly of the present embodiment includes a rotor 100, a bearing housing 200, a protection bearing 300, and a magnetic bearing body 400; the structure shown in fig. 2 is a cross-sectional structure diagram formed by cutting the whole structure along the axial direction of the rotor 100, specifically, the magnetic bearing body 400 includes a circular hole 410, a rear axial bearing core 420, a thrust disk 430, an axial core 440, magnetic steel 450, a rear bearing coil 460, a front axial bearing core 470 and a front bearing coil 480; the thrust disc 430 is fixed on the rotor 100 by means of interference fit, the front bearing coil 480 and the rear bearing coil 460 are wound on the front axial bearing core 470 and the rear axial bearing core 420 respectively, and the axial core 440 and the magnetic steel 450 are installed inside the rear axial bearing core 420, and the specific working process between these structures is well known to those skilled in the art, that is, the prior art, and will not be described herein.

This embodiment differs from the prior art in that:

in this embodiment, the magnetic bearing body 400 and the bearing chamber 200 are integrally formed, the protection bearing 300 is detachably connected in the bearing chamber 200, and the protection bearing 300 can be directly mounted on the magnetic bearing body 400 by integrally forming the magnetic bearing body 400 and the bearing chamber 200, so that the protection bearing 300 and the magnetic bearing body 400 are integrated, the integral structure is simpler, the number of parts to be assembled is reduced, the assembly process is simpler, the assembly is more convenient, and the cost is saved; in addition, after the number of assembled parts is reduced, the accumulated tolerance of the parts can be effectively reduced.

Specifically, the bearing chamber 200 may be provided at the inner wall of the circular hole 410.

Further, since the rotor 100 is inserted from one end of the circular hole 410 and then is inserted from the other end of the circular hole 410, the bearing chamber 200 can be disposed at the other end of the circular hole 410, and thus the bearing chamber 200 can be conveniently detached or installed to protect the bearing 300, thereby bringing convenience to the actual assembly.

Further, the bearing housing 200 may be disposed in a hole formed in the rear axial bearing core 420 for the rotor 100 to pass through, the hole being a part of the circular hole 410 and being located at the other end of the circular hole 410.

As shown in fig. 1, in the prior art, the protection bearing 9 is assembled on the rear axial bearing core 42 through the bearing chamber 7, and the bearing chamber 7 and the protection bearing 9 are stacked along the axial direction of the rotor 100, thus resulting in a longer axial dimension of the whole magnetic suspension bearing, since the rotor 1 needs to be used with the protection bearing 9, that is, the rotor 1 must pass through the protection bearing 9 to protect the rotor 1 by the protection bearing 9, which results in a longer axial dimension of the rotor 1; the direct defect caused by the longer axial dimension of the rotor 1 is that the fixed frequency of the rotor is low, namely the inherent frequency of the rotor is low, so that the rotor cannot reach higher rotating speed; the specific reasons are as follows: the natural frequency of the rotor is the vibration frequency of the rotor, and the critical rotation speed is the rotation speed of the rotor when the vibration frequency of the rotor rotates is equal to the resonance occurring when the natural frequency of the rotor is equal to the vibration frequency of the rotor, namely, the longer the length of the rotor is, the lower the critical rotation speed is, and the rotation speed of the rotor can vibrate when exceeding the critical rotation speed.

Therefore, in order to shorten the axial dimension of the rotor 100, as shown in fig. 2, the bearing chamber 200 may be provided as an annular groove, and the protection bearing 300 may be entirely located inside the annular groove, that is, the end of the protection bearing 300 may not protrude from the inside of the annular groove, so that the protection bearing 300 may be penetrated while the rotor 100 penetrates through the circular hole 410 of the magnetic bearing body 400, so that the axial length of the rotor 100 may be shortened, the frequency of the rotor 100 may be increased, and the rotor 100 may reach a higher rotation speed.

The specific mounting manner of the protection bearing 300 is as follows:

the protection bearing 300 is pressed in the bearing chamber 200 by the bearing cap 310; the bearing cap 310 is fixedly mounted on the magnetic bearing body 400 by a fastener 320, and in this embodiment, the fastener 320 may be a bolt.

In the use process of the embodiment, when the rotor 100 is unstable, the rotor will collide with the protection bearing 300 first, so as to avoid the rotor 100 from directly contacting with the magnetic bearing body 400, thereby protecting the magnetic bearing body 400.

Claims

1. A magnetic levitation axial bearing assembly comprising:

a rotor (100);

a bearing chamber (200);

a protection bearing (300), wherein the protection bearing (300) is sleeved on the rotor (100); and

and the magnetic bearing body (400) is rotationally connected with the rotor (100), the magnetic bearing body (400) and the bearing chamber (200) are integrally formed, and the protection bearing (300) is detachably connected in the bearing chamber (200).

2. The magnetic suspension axial bearing assembly according to claim 1, characterized in that the magnetic bearing body (400) is provided with a circular hole (410) for the rotor (100) to pass through, and the bearing chamber (200) is arranged on the inner wall of the circular hole (410).

3. The magnetic levitation axial bearing assembly of claim 2, wherein the bearing chamber (200) has a stepped annular groove configuration in a longitudinal section for capturing an outer contour of the protective bearing (300) in the bearing chamber (200).

4. A magnetic levitation axial bearing assembly according to claim 3, wherein the rotor (100) penetrates from one end of the circular hole (410) and penetrates from the other end, and the bearing chamber (200) is provided at the other end of the circular hole (410).

5. The magnetic levitation axial bearing assembly of claim 1, wherein the magnetic bearing body (400) comprises a rear axial bearing core (420), the bearing chamber (200) being disposed on the rear axial bearing core (420).

6. Magnetic levitation axial bearing assembly according to any of claims 1-5, characterized in that the protection bearing (300) is pressed in the bearing chamber (200) by means of a bearing cap (310).

7. The magnetic levitation axial bearing assembly of claim 6, wherein the bearing cap (310) is fixedly mounted to the magnetic bearing body (400) by a fastener (320).

8. The magnetic levitation axial bearing assembly of claim 1, wherein the rotor (1) further has a thrust disc (430) interference fit thereon, the thrust disc (430) being rotationally embedded in an inner cavity on the magnetic bearing body (400).

9. The magnetic levitation axial bearing assembly of claim 8, wherein the magnetic bearing body (400) comprises a front axial bearing core (470) having a front cavity in which a front bearing coil (480) is disposed and a rear axial bearing core (420) having a rear cavity in which a rear bearing coil (460) is disposed, bowl-fastened to each other to form an inner cavity.

The axial iron core (6) is arranged at the periphery of the thrust disc (430), and the magnetic steel (450) is arranged on the axial iron core (6).

10. A compressor comprising a motor on the compressor, further comprising a magnetic bearing assembly as claimed in any one of claims 1 to 9, wherein the magnetic bearing assembly is disposed on the motor in the compressor.